Submitted to: Arthropod Management Tests
Publication Type: Other
Publication Acceptance Date: December 2, 1998
Publication Date: N/A
Interpretive Summary: The two-spotted spider mite is a troublesome pest for southern Idaho bean producers. Presently, these producers rely on pesticides to control mites. However, we should be able to endow beans with resistance to mites, thereby reducing the use of pesticides and the risk of environmental and health problems, if resistance can be located in bean germplasm stored in the USDA AARS repository at Pullman, Washington. Field screening of over 5,700 accessions from the bean collection by USDA-ARS entomologists identified approximately 15 accessions with mite resistance. This greenhouse research confirmed that mite resistance resides in bean germplasm, although less than five accessions appear to possess a level of resistance for use in breeding. This report is intended as a summary of data for entry into the Genetic Resources Information Network of the U.S. National Plant Germplasm System.
Technical Abstract: A greenhouse trial evaluated 20 plant introduction lines of Phaseolus vulgaris and one cultivar for two-spotted spider mite resistance. The lines were the most resistant lines and some highly susceptible lines from an earlier field screening of 5,755 accessions from the germplasm repository at Pullman, Washington. High mite populations developed with significant differences for mean numbers of mites per plant among lines. Five accessions (PI 151041, 318696, 171786, 318700, 136677) exhibited low levels of resistance to mite feeding, while two accessions (PI 151041 and 169739) supported low mite densities.